Osteen slumped in 1992 with Huntsville (5-5, 3.61) and the Tacoma Tigers
(0-2, 10.75 in 4 G). He was with the same two clubs in 1993, with better results: 7-3, 2.30 for Huntsville; 7-7, 5.08 for Tacoma. He led A's farmhands in wins, two ahead of Steve Wojciechowski, Miguel Jimenez and Russ Brock. He was 8-9 with a 5.27 ERA for Tacoma in 1994, tying for 9th in the 1994 PCL in losses. The injury bug then sidelined Osteen. He pitched only one game (2 shutout innings) for the 1995 AZL A's and missed all of 1996.